1 files changed, 9 insertions, 0 deletions

diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c
index 4bacb50e9ad9..6330788c1c2b 100644
--- a/sound/usb/usbmidi.c
+++ b/sound/usb/usbmidi.c
@@ -1351,6 +1351,13 @@ static int snd_usbmidi_get_ms_info(struct snd_usb_midi* umidi,
                         endpoints[epidx].out_ep = ep->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
                         if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)
                                 endpoints[epidx].out_interval = ep->bInterval;
+                        else if (snd_usb_get_speed(umidi->chip->dev) == USB_SPEED_LOW)
+                                /*
+                                 * Low speed bulk transfers don't exist, so
+                                 * force interrupt transfers for devices like
+                                 * ESI MIDI Mate that try to use them anyway.
+                                 */
+                                endpoints[epidx].out_interval = 1;
                         endpoints[epidx].out_cables = (1 << ms_ep->bNumEmbMIDIJack) - 1;
                         snd_printdd(KERN_INFO "EP %02X: %d jack(s)\n",
                                     ep->bEndpointAddress, ms_ep->bNumEmbMIDIJack);
@@ -1364,6 +1371,8 @@ static int snd_usbmidi_get_ms_info(struct snd_usb_midi* umidi,
                         endpoints[epidx].in_ep = ep->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
                         if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)
                                 endpoints[epidx].in_interval = ep->bInterval;
+                        else if (snd_usb_get_speed(umidi->chip->dev) == USB_SPEED_LOW)
+                                endpoints[epidx].in_interval = 1;
                         endpoints[epidx].in_cables = (1 << ms_ep->bNumEmbMIDIJack) - 1;
                         snd_printdd(KERN_INFO "EP %02X: %d jack(s)\n",
                                     ep->bEndpointAddress, ms_ep->bNumEmbMIDIJack);